Do you have a web page? Are you a self taught programmer? If your answer is yes then learning JavaScript will put you at a great advantage. You could implement it into your web site to make it more user friendly or more interesting and fascinating. JavaScript can also help peole who already know a programming language because JavaScript is a mixture of different languages merged into one. Whatever your needs are, learning JavaScript will give you a sense of satisfaction.
Here are a collection of tutorials that I have written which should teach you how to ultimately write your own scripts. Even if you do know some JavaScript, reading these tutorials will improve your knowledge.
Enjoy!
Note: these tutorials assume that you know how to make a basic web page using HTML.